Adhesive



g 1932 1.. c. STILLE 1,869,783

ADHESIVE Filed Jan. 10, 1929 FIG. i.

[/WENTOR. .ZAURENCE 6 5mm Patented Aug. 2, 1932 UNITED STATES PATENT OFFICE v LAURENCE CARL STILLE, OF VALPARAISO, INDIANA, ASSIGNOR, BY MESNE ASSIGN- MENTS, T GEORGE C. PETERSON C'O., OF CHICAGO, ILLINOIS, A CORPORATION OF.

DELAWARE ADHESIVE Application filed. January 10, 1929. Serial No. 331,639.

My invention relates to an adhesive forcomposition material wood or in fact any material which is ca ableof resisting a tem perature of substantially 250 degrees Fahrenheit, which temperature is used in the process of binding together the two surfaces by means of adhesive.

In the particular exemplification of my invention, I have illustrated my adhesive as a means for securing an abrasive or grinding disk to a metal disk, rigidly mounted on a rotating shaft. The adhesive, while particularly adaptable to this use, is likewise useful as a binder for securing together two metal parts or any material which is capable of resisting a temperature of substantially 250 degrees Fahrenheit, which temperature is involved in the process of adhering the parts together by means of my improved adhesive.

In order clearly to illustrate my invention, I herein refer to its applicationas an adhe sive for securing an abrasive disk to its shaft mounting whereby the disk is rotatably mounted upon the shaft and may be used for the usual side dressing or grinding operation.

One of the objects of my present invention is to provide an adhesive adapted to securely bind a heavy duty member, such as a grinding disk, to its mounting on a rotating shaft such as a metallic disk and to provide an adhesive such that atmospheric air, charged with moisture, or even water itself, will not aflect the binding qualities of the adhesive and the grinding disk will at all times be securely and rigidly adhered to its metallic mounting and will not come loose or fly off under the most strenuous grinding operations. i

Still another object of my invention resides in the method of making the adhesive and particularly in the adheslve itself.

The method of fastening the grinding disk to its metal supportingplate is disclosed and claimed in a divisional application.

These and other objects of my invention will be apparent from a perusal of the following specification when taken in connection with the accompanying drawing, where- 1n: Figure l is a side view of one application of my improved adhesive, the same being shown for securing. an abrasive disk to a metallic disk mounted on a rotating shaft; Figure 2 is a perspective view of an"abra slve disk carrying'a substantially dry coat-' ing of my improvedadhesive; and

Figure 3 is a perspective view of a flexible abrasive fabric having the abrasive on one side as a coating and my improved adhesive as a coating on the opposite side.

Specifically, my improved adhesive consists of the following. as a single batch, and in the following proportions:

16 lbs. T. N. -shellac gum, 8 lbs. Pontianak gum, 2 lbs. titanium oxide, 22 lbs. asbestine, 22 lbs. alcohol.

The T. N. shellac gum is a flake shellac commercially purchased in the trade as T. N.

This shellac lends good adhesive or sticking qualities to the final adhesive.

The Pontianak gum assists in the mixture in taking the flimsy coating from the shellac when it is warm. In explanation, it might be said that the T. N. or flake shellac has the effect of hardening from the surface inward. The Pontianak gum, when mixed with the T. N. shellac gum aflects the former so that the T. N. shellac gum will harden uniformly all through. Furthermore the Pontianak gum is much cheaper than the shellac .gum.

The titanium oxide, as an element of the ultimate adhesive, has the function of hardening the gum and also lending a metallic characteristic to the final adhesive. Furthermore, it has been found that in the presence of titanium oxide, the combination of Pontianak gum and the T. N. gum not soften as quickly. It has been found that with the titanium oxide present, the gums will not start to soften before 175 to 200 degrees the heated Fahrenheit, or from approximately 150 to 175 degrees Fahrenheit. The asbestine, a

\ fibrous talc, is selected as a specific inert material and functions as an extender so as to make more bulk of the material. Furthermore, it assists in brushing and flowing when applied. It also helps the ultimate mixture in drying more quickly and effects it so that no sediment will settle in the container. Any type of inert material may be used such as silica.

In making up the foregoing batch of material, the solvent is placed in the containers, then the gums and the mixture is thoroughly agitated until thoroughly dissolved. In order to expedite the process, the foregoing mixture is preferable heated two or three hours. After this, the titanium oxide is added and this mixes in with the shellac and the gum and finally the asbestine is added. The titanium oxide cuts the heavy body of the gums and makes the mixture more uniform. When the mixture is finished, it is a sort of semi-paste.

The method of applying theadhesives on substances to be put togetheris best illustrated by reference to the operation of securing a grinding disk to its metallic disk as shown in the drawing, wherein the shaft 2 is shown as provided with an integrally secured collar 4 secured to a metal disk 6 by means of the bolts 8. The abrasive disk 10 is shown as rigidly secured to the disk 6 by means of my improved coating of adhesive 12. In the present instance, the adhesive is applied as a coating 12 to the grinding disk 10. The coatingis then preferably permitted to air dry upon the grinding disk because when the abrasive is wet, it retains some of the moisture. It should be distinctly understood, however, that it is necessary to dry the adhesive before using because the adhesive will adhere even though it is used under water. It is waterproof.

After the adhesive has been placed upon the grinding disk and dried, the disk or plate 16 is then heated to approximately 250 degrees Fahrenheit and then the grinding disk carrying the coating is applied directly to late, which latter sufiiciently heats the ad esive coating on the grinder,

and pressure is then applied until the heated plate has cooled off, at which time it will be found that the grinding disk is securely united to the metal disk. The 'abovcmethod of fastening the grinding disk is inserted herein merely for the purpose of explaining the use of the compound, the method being separatel claimed in the aforesaid copending divisional application.

It must be obvious that in lieu 'of,adhering the grinding disk to a" metal disk, any type of surfaces may be united provided they are able to-stand the temperature required to sufliciently heat the coating of adhesive matities and proportions of the ingredients given above, since the invention alsogincludes' any reasonable variation of such proportions and it is further understood that any well known equivalents of any of the ingredients,

' having the same characteristics, may be used in lieu of the substances given. However, the ingredients stated and the proportions given afford satisfactory results.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

,1. An adhesive of the character described consisting of shellac gum, Pontianak gum, titanium oxide, an inert filler and a solvent.

2. An adhesive of the character described consisting of shellac gum, Pontianak gum, titanium oxide, fibrous talc and alcohol.

3. An adhesive consisting of shellac gum, Pontianak gum, titanium oxide, fibrous talc, and alcohol.

. 4. An adhesive consisting of the following ingredients and in the following proportions 16 lbs. shellac gum, 8 lbs. Pontianak gum, 2 lbs. titanium oxide, 22 lbs. fibrous talc, 22 lbs. alcohol.

5. The method of forming a substantially water-proof adhesive of the character described which consists in mixing shellac gum and Pontianak gum with alcohol and agitating the same until thoroughly dissolved and preferably under heat, then adding titanium oxide and finally adding fibrous talc and agitating the mixture until it forms a semipaste.

6. The process of making an adhesive of,

the character described which comprises mixing shellac, Pontianak gum and alcohol and vigorously agitating the mixture until the shellac and gum are thoroughly dissolved in the alcohol, and then successively adding a metallic oxide and an inert filler While agitating the mix until a semi-fluid paste is formed.

In witness whereof, I have hereunto subscribed my name.

LAURENCE CARL STILLE. 

